FR3044989B1 - CONNECTION MODULE AND MOTOR VEHICLE WIPER ARM BRUSH ARM ASSEMBLY - Google Patents

Abstract

The invention relates to a connection module (3) intended to be connected to a motor module (2) of a motor vehicle windscreen wiper arm assembly (1), the connection module (3). comprising: - a circuit of conductive tracks (11) comprising: - a first supply conductor track (P1) intended to be connected to a first terminal (+ Bat) of the motor module (2), and - a second conductive track d power supply (P2) for connection to a second terminal (-Bat) of the motor module (2), and - a ferrite core (14; 17; 20) surrounding the first and second supply conductor tracks (P1, P2), characterized in that the ferrite core (14; 17; 20) is made in one piece. The invention also relates to a motor vehicle windscreen wiper arm assembly (1) comprising a motor module (2).

Description

The invention relates to a connection module for motor vehicle windshield wiper blade assembly, intended to be connected to a motor module. The invention also relates to a motor vehicle windshield wiper arm assembly.

DC motors used for the equipment of automotive vehicles, particularly windscreen wiper motors, comprise a commutator which is provided on the sectors of which power brushes in contact with the commutators allow the supply of the armature and the drive. of the motor.

During the operation of this type of motor, the contact of the power brushes on the successive discrete sectors of the collector causes transient switching phenomena, when switching the successive electrical contact of the supply brushes with the discrete sectors of the rotating collector.

These transient phenomena are generators of noise and / or interference, which can be analyzed in erratic harmonic frequency pulses, at very high frequency. The pulses may have a frequency of between 100 MHz and several GHz at a high amplitude level, especially when switching the contact of the power supply pads on the successive sectors of the collector.

These parasites and / or interference can propagate without much difficulty on the supply lines and / or signal transmission of the vehicle, which can cause problems of safety and / or electromagnetic pollution.

In this, they appear detrimental not only to the comfort of users of the vehicle, when these parasites and / or interference spread, for example, on the audio circuits of a radio frequency receiver of the vehicle, but also to the proper functioning, or even safety, of the vehicle, when these propagate on the control lines, control or regulation of the vehicle components, such as in particular the speed control and / or braking and / or driving ("Steer by wire") and / or deguidage vehicle type GPS and / or receivers TNT, Wifi, Bluetooth or other.

These parasites and / or interference can also be detrimental to the functioning of the onboard memory and computing circuits fitted to current motor vehicles.

Among the solutions of the prior art used to reduce the level of amplitude of these parasites and / or interference, there is known a filter indenator / band eliminator electromagnetic inductions having a ferrite core inductance formed by a first and a second core elements of identical ferrite placed vis-à-vis to form a passage sleeve surrounding at least one of the conductive tracks of alimentation. The ferrite core members are held facing each other by a ratchet finger of the closure plate.

However, there are difficulties of realization. Indeed, misalignment of the first and second ferrite core elements may generate an air gap that may reduce the attenuation performance of the electromagnetic interference of the ferrite core inductor. In addition, this achievement is expensive.

An object of the present invention is to improve the prior art filtering device of the state of the art. For this purpose, the present invention relates to a connection module intended to be connected to a motor module of a motor-wiper arm assembly motor vehicle, the connection module comprising: - a circuit of conductive tracks comprising: - preferably at a first end, a first power supplyconductor intended to be connected to a first terminal of the motor module, and - preferably at a second end, a second conductive supply track intended to be connected to a second terminal of the motor module, and - a ferrite core surrounding the first and second power supply conductors, - characterized in that the ferrite core is made in a single piece.

The ferrite core thus arranged closer to the motor module, makes it possible to attenuate / eliminate the propagation of the residual high frequency interference signals generated by the switching of the motor supply brushes to the conductive track circuit of the connection module.

The ferrite core made in one piece avoids the manufacture of two separate parts to assemble, which facilitates the manufacture, lemontage and reduces costs. Possible alignment problems of the first and second ferrite core elements of the prior art are avoided which may reduce the attenuation performance of parasitic disturbances.

According to one or more characteristics of the connection module, taken alone or in combination, the ferrite core comprises a single common housing traversedby the first and second conductive supply tracks, the ferrite core has a generally parallelepipedal shape, the core of ferrite comprises a first and a second sleeves connected together by a jumper, the first sleeve surrounding the first conductive supply track and the second sleeve surrounding the second feed conductor track; the ferrite core comprises a first part having a common housing traversed by the first and second power supply conductors and a second portion having first and second sleeves connected together by a jumper, the first sleeve surrounding the first power supply conductor and the second sleeve surrounding the second power supply regulator, - the large faces d The first and second conductive feed tracks face each other. Thus straightened on their edges, the conductive feed tracks can be inserted into the ferrite core without it being too bulky, - the connection module comprises a closure case comprising a housing receiving the circuit of conductive tracks and a means of clipping configured to maintain the nucleus deferrite - the connection module comprises a cover fixed to the closing case by capping the circuit of conductive tracks. The conductor tracks and the ferrite core are thus protected against dust or moisture from the external environment. In addition, the cover makes it possible to improve the maintenance of the conductive track circuit and the ferrite core, in particular by limiting their vibration in the closure box. A bonnet support area located at the ferrite core is also used to drive the feed conductor tracks into the wafer circuitry of the wafer metal circuit and to ensure that the ferrite core is properly interlocked. The invention also relates to a motor vehicle windscreen wiper arm assembly comprising a motor module, characterized in that it furthermore comprises a connection module as previously described, including the first power supply conductor track. is connected to a first born of the motor module and the second power conducting track is connected to a second terminal of the motor module.

According to one or more characteristics of the motor assembly, taken alone or in combination, the first and second terminals are carried by a metal blade circuit of the motor module, the circuit of metal platelets being intended to be connected to the power supply brushes of an engine direct current, - the motor module comprises a noise filter comprising at least one inductor and at least one capacitor, intended to be connected to a DC motor. The noise filter formsa first filtering stage for attenuating at least part of the electromagnetic disturbances generated by the operation of the DC motor. Other advantages and features will become apparent upon reading the description of a non-limiting embodiment of the invention, as well as the appended figures in which: FIG. 1 shows a wiper arm-motor assembly; motor vehicle, - Figure 2 is an electrical diagram of the motor module, - Figure 3 shows elements of the motor assembly of Figure 1, - Figure 4 shows a rear view of the elements of Figure 3, - Figure 5 shows a top view of elements of the disconnection module of FIG. 1, - FIG. 6 shows conductive supply tracks and a ferrite core of FIG. 5, according to a first embodiment, - FIG. FIG. 8 shows conductive feed tracks and a second embodiment of the ferrite core; FIG. 9 shows a connection module comprising a ferrite core according to FIG. a third embodiment; FIG. 10 shows feeder conductor tracks and the ferrite core of FIG. 9; FIG. 11 shows a rear view of FIG. 10; FIG. 12 shows a perspective view of the core. ferrite of Figure 9.

In these figures, identical or similar elements bear the same reference numbers.

The following achievements are examples. Although the description refers to one or more embodiments, this does not necessarily mean that each reference relates to the same embodiment, or that the features apply only to a single embodiment. Simple features of different embodiments can also be combined to provide other achievements.

FIG. 1 shows a motor assembly 1 of an automobile vehicle wiper arm, for example for rear wiping of the automotive vehicle. The motor unit 1 comprises a motor module 2 and a disconnection module 3 intended to be connected to the motor module 2.

The motor module 2 comprises a DC motor M and a filteranttiparasite 4 (see Figure 2) connected to the DC motor M.

Better visible in FIGS. 2 and 3, the DC motor has a rotary manifold 5 on the sectors of which power brushes 6 (or "coals") in contact with these sectors allow the power supply of the armature and the drive of the motor. The motor rotor shaft M carries a worm gear 7 meshing with a gear device for driving an output shaft for driving a pivoting wiper blade (not shown).

The noise filter 4 comprises for example an LC circuit comprising at least one inductor and at least one capacitor. The noise filter 4 forms a first filter stage for attenuating at least in part the electromagnetic disturbances generated by the operation of the DC motor M.

According to an exemplary embodiment shown in FIG. 2, the interference filter 4 comprises at least: a first inductor L1 disposed between the positive supply terminal of the motor M and a first terminal + Bat (or positive terminal of the battery); second inductor L2 arranged between the negative power supply terminal of the motor M and a second terminal -Bat (or mass of the vehicle), - a first capacitor C1 connected in parallel between the positive power supply terminal and the negative supply terminal of the motor M and a second capacitor, denoted C2, C3, formed in the present case by two series capacitors, connected in parallel between the first + Bat terminal and the second -Bat terminal.

The ground terminal of the motor M is noted in FIG. 2 by a black point of connection to the metal casing of the motor, which can be connected to the second terminal -Bat and between the two electrical capacitors C2, C3.

According to an exemplary implementation visible in FIGS. 3 and 4, the motor module 2 comprises a wafer carrier 8, for example made of plastic material, and a metal wafer circuit 9 carried by the wafer carrier 8.

The inductances L1, L2 and the capacitors C1, C2, C3 of the noise filter 4 are carried by the wafer carrier 8 (only one capacitor C1 is shown in the figures) and connected via the circuit of metal plates 9.

The metal pad circuit 9 is also connected to the supply brushes 6 of the DC motor M. The metal pad circuit 9 also carries at two ends, the first and second terminals + Bat, -Bat of the motor module 2.

Returning to FIG. 1, the connection module 3 comprises a closure housing 10, a conductive track circuit 11 received in a housing 12 of the closure housing 10 and a second electromagnetic interference filtering stage.

The closure housing 10 makes it possible to fix the connection module 3 to the motor vehicle. To this end, it has fastening means, such as catches 13, of which there are three in the example of FIG. 1. The closing box 10 also has a barrel 21 intended to pass through the vehicle body for the passage of the shaft. output driving the wiper arm (not shown).

The closure housing 10 is for example made of plastic material and obtained by molding.

The circuit of conductive tracks 11 preferably comprises at a first end, a first supply conductor track P1 connected to the first terminal + Bat of the motor module 2 and preferably to a second end, a second supply conductor track P2 connected to the second end -Bat of motor module M.

The circuit of conductive tracks 11 is for example a cut circuit.

The conductive tracks circuit 11 electrically connects the DC motor M to a motor vehicle battery. It also makes it possible to provide an output signal relating to the positioning of the motor M.

The second electromagnetic interference filtering stage is formed by a ferrite core 14.

The second electromagnetic interference filtering stage makes it possible to obtain a second attenuation / elimination of the propagation of the high frequency interference signals generated by the switching of the power supply brushes 6 of the motor M towards the conductive track circuit 11 of the connection module 3 by absorbing and then dissipating the energy of the high frequency alternating currents generated by the operation of the DC motor M.

The ferrite core 14 surrounds the first and second power supply conductors P1, P2. It is thus arranged as close as possible to modulemoteur 2.

The ferrite core 14 surrounding the two power conducting tracks P1, P2 is made in one piece. It is for example obtained by molding.

This avoids the manufacture of two separate parts to assemble, which makes manufacturing, assembly and reduces costs. Possible problems of alignment of the first and second ferrite core elements of the prior art are avoided which may reduce the attenuation performance of interference disturbances.

In addition, it is expected that the large faces of the first and second conductive supply tracks P1, P2 face each other. The circuit of conductive tracks 11 thus has power supply conductor tracks P1, P2 arranged on the wafer and conductive tracks laid flat in the housing 12 of the closure housing 10. Thus straightened on their wafers, the power conducting tracks P1, P2 can to be inserted in the nucleus 14 made of a single piece without it being too large. Complementarily, the + Bat, -Bat terminals of the metal chip circuit 9comprove notches receiving the conductive supply conductors P1, P2sensibly orthogonally. The contact of the power conducting tracks P1, P2 engaged in the notches of the metal pad circuit 9 is further improved with respect to the rubbing contacts of the state of the art.

On assembly, the supply conductor tracks P1, P2 are inserted into the ferrite core 14, and this is then mounted in the housing 12 of the closure housing 10.

The ferrite core 14 is, for example, immobilized in a clearing cavity 12.

According to another embodiment, the housing 12 has a clipping means configured to hold the ferrite core 14 by elastic locking. For example, and as shown in FIG. 5, the unclipping means comprises two resilient lugs 15, integral with the closure housing 10, cooperating with the ferrite core 14 to hold the ferrite core 14 in the housing 12.

It can further be provided that the connection module 3 comprises a cover 22 fixed to the closure housing 10 by capping the circuit of conductive tracks 11 (FIG. 7). The cover 22 is fixed to the closure housing 10, for example by clipping.

The conductive tracks 11 and the ferrite core 14 are thus protected against dust or moisture from the external environment. In addition, the cover 22 makes it possible to improve the maintenance of the circuit of conductive tracks 11 and the ferrite core 14, in particular by limiting their vibration in the housing 12.

The cover 22 is also used during the mounting of the connection module 3 in the engine module 2. In fact, it uses a bearing zone Zdu hood 22 located above the ferrite core 14 to drive the tracksconductrices supply P1, P2 of the connection module 3 in the notches of the metal pad circuit 9 of the wafer holder 8 of the motor module 2.The support on the support zone Z also makes it possible to ensure proper interlocking of the core ferrite 14 in the elastic tabs 15.

In the first embodiment illustrated in FIGS. 1, 3, 4, 5 and 6, the ferrite core 14 made in one piece comprises a single common housing 16 through which the two supply conductor tracks P1, P2 pass. Ferrite core 14 has a generally parallelepipedal shape.

The magnetic field lines formed by the high frequency parasitic alternating currents are guided by the parallelepipedal shape of the ferrite core 14 to form a closed loop whose complete path may be inscribed in the periphery of the ferrite core 14. It is thus ensured that the magnetic field is well closed in the ferrite core 14.

In addition, the two power conducting tracks P1, P2 are contained in the same loop of magnetic field lines (FIG. 6, arrow B1).

According to a second embodiment shown in FIG. 8, the ferrite core 17 made in one piece comprises two sleeves 18 interconnected by a bridge 19, each sleeve 18 surrounding a respective feed regulator P1, P2.

The magnetic field lines formed by the high parasitic alternating currents are guided by the annular shapes of the two sleeves 18 to form two closed loops. The complete paths of the loops can be inscribed in the ferrite core 17, which makes it possible to ensure that the magnetic field is well closed in the ferrite core 17.

In addition, each supply conductive track is contained in a clean loop of magnetic field lines associated with a respective sleeve (arrows B2). Electromagnetic disturbances are thus attenuated on each independently conducting supply path P1, P2.

According to a third embodiment shown in Figures 9, 10, 11 and 12, the ferrite core 20 made in one piece has a first and second second part arranged back to back.

The first part comprises a common housing 16 traversed bytwo power conducting tracks P1, P2.

The second part comprises two sleeves 18 connected together by a pad 19, each sleeve 18 being traversed by a respective power supply track P1, P2.

The first portion forming a common housing 16 through which the two conducting conductors P1, P2 feed is for example arranged on the end side of the supply conductor tracks P1, P2 intended to be respectively connected to the first terminal + Bat and the second terminal -Bat.

Thus, in the second part, the magnetic field lines are guided by the annular shapes of the two sleeves 18 of the ferrite core 20 to form two independent closed loops (arrows B2).

And in the first part, the magnetic field lines are guided by the parallelepipedal shape of the ferrite core 20 to form a single closed loop (arrow B1).

Claims (4)

claims Connection module (3) for connection to a motor module (2) of a motor vehicle windscreen wiper arm assembly (1), the connection module (3) comprising: - a conductive track circuit (11) comprising: - a first supply conductor track (P1) intended to be connected to a first terminal (+ Bat) of the motor module (2), and - a second supply conductor track (P2) intended to be connected to a second terminal (-Bat) of the motor module (2), and - a ferrite core (14; 17; 20) surrounding the first and second conductive supply tracks (P1, P2), the core ferrite ( 14; 17; 20) being formed in one piece, said connection module (3) being characterized in that the major faces of the first and second power conducting tracks (P1, P2) face each other. 2. Connection module (3) according to the preceding claim, characterized in that the ferrite core (14) comprises a single common housing (16) traversed by the first and second conductive supply tracks (P1, P2). 3. Connection module (3) according to the preceding claim, characterized in that the ferrite core (14) has a generally parallelepipedal shape. 4. Connection module (3) according to claim 1, characterized in that the ferrite core (17) comprises a first and a second sleeves (18) connected together by a bridge (19), the first sleeve (18) surrounding the first conductive feed track (P1) and the second sleeve (18) surrounding the second feed conductor track (P2). 5. Connection module (3) according to claim 1, characterized in that the ferrite core (20) comprises a first portion having a common housing (16) traversed by the first and second supply conductors (P1, P2) and a second portion having first and second sleeves (18) interconnected by a bridge (19), the first sleeve (18) surrounding the first power conducting track (P1) and the second sleeve (18) surrounding the second conducting track of power supply (P2). 6. Connection module (3) according to one of the preceding claims, characterized in that it comprises a closure housing (10) comprisinga housing (12) receiving the conductive track circuit (11) and a clipping means (15). ) configured to hold the ferrite core (14; 17; 20). 7. Connection module (3) according to the preceding claim, characterized in that it comprises a cover (22) fixed to the closure housing (10) embalming the circuit of conductive tracks (11). 8. Motor vehicle wiper arm assembly (1) comprising a motor module (2), characterized in that it additionally comprises a connection module (3) according to one of the preceding claims, the first of which conductive supply track (P1) istrelated to a first terminal (+ Bat) of the motor module (2) and the second conductive supply track (P2) is connected to a second terminal (-Bat) of the motor module (2). 9. Motor assembly (1) according to the preceding claim, characterized in that the first and second terminals (+ Bat, -Bat) are carried by a circuit of metal plates (9) of the motor module (2), the circuit of metal blades (9 ) being intended to be connected to the power brushes (6) of a DC motor (M). 10. Engine assembly (1) according to one of claims 8 or 9, characterized in that the motor module (2) comprises a noise filter (4) comprising at least one inductor (L1, L2) and at least one capacitor (C1, C2, C3) for connection to a DC motor (M).